Method of making emulsions



jan, 20, 1925. 1,523,933

.J. A. DE CEW METHOD OF MAKING EMULSONS Original Filed April 26, 1920SIZE H 0T WATER coLD WATER.

INVENTOR -uosoN DECEW BY @maxim-M ATTORN EY Patented Jan. 20, 1925.

i erases ear er erstes JUDSON A. DECEW, 0F NEW' YORK, N. Y., ASSIGNOR TOPROCESS ENGIN'EES, INCOR- PORATED, OF NEW YORK, N. Y., A CORPORATION OFNEW YORK.

METHOD or Mimmoy EMULsI'oNs. Y

Application led April 26, 1920, Serial No. 376,660. Renewed May 1, 1923.

.following is a specification.

In the process of sizing paper various ,methods have been employed inthe diluting of the rosin soap used for .this purpose, which methods aremore or less suitable to the kinds of rosin ysize being used.

Then a rosin soap is used which conta ins free rosin dissolved therein,it is very diiiicult to dilutethis size in a large volume of water,either hot or cold, without separation of the free rosin taking place,the combination not being directly soluble in an aqueous liquid of highdilution.

The most careful method of diluting a such substances as abovedescribed, wit

`water, would be to start with a small quan-.

tity of size at a boiling temperature and with rapid stirring, add hotwater slowly without aitect-ing. the stability of the compound.

This method,-however, is Anot practicable in paper mill practice owingto the large quantityof material used and the slowness ot the operation.

I have therefore, devised a method of progressive dilution by means ofhot water which is added at various stages in the diluting process sothat after the Size is dissolved in the first quantity of hot water, itwillI come in contact with second and subsequent quantities of hotwater, etc., until it reaches a stage of dilution where it can bechilled and stabilized with cold water without any separation ordecomposition taking place.

A method of carrying out this process is to allow the hot size to passinto the pipe where it comes in contact with aA small stream of hotwater, where agitation takes place as the materials commingle and as themixture flows along the pipe, is is furthe-r diluted by a second streamof )hot water also ata high tempera-ture.

Such a Ydevice may be illustrated in theV accompanying drawing in which1 indicates a reservoir of size 2 having an outlet pipe 3 connecting b-ymeans of an elbow 7 with a horizontal pipe 4 communicating with a tank 5of cold water 6.- 7 indicates`4 an elbow between the pipes 3 and 4 andinto this elbow 7 enters a pipe 8 of hot water which pipe terminates ina nozzle 9. 10 indicates a second hot water pipe entering the pipe 4 andter terminating in the nozzle^l3, the nozzles 9,

ll and 13 all being directed toward the cold water tank 5. The pipes 3,8, 10 and 12 of course may lbe suitably controlled by valves.

In the drawing, the various pipes have vindications of steam arisingtherefrom. This is not actually the case but it is to indicate that thepipes are hot. In operation, the size 2 coming down the pipe 3 comes incontact with hot water from the nozzle 9 and is somewhat diluted. As itprogresses, it comes in contact with the hot jwater Jfrom the nozzle 11or it is further diluted andfas it progresses again, it is still furtherdiluted by the hot Water from the nozzle 13. Then it emerges into thecold `water 6 for stabilizing the emulsion.

By these successive stages ofV dilution, a similar condition is obtainedto that in which hot water is stirred slowly into the thick size butinasmuch as it takes place in a pipe and the action is continuous, thetime` tion is taking place inasmuch as the pressure j will be least atthe point where the Jforce of the stream of water exercises a pull4 onthe stream of size.

The alternation of pressure increases the agitation of the mixture andalso the rate of solution for the hot size comes in contact withwater ata low pressure which is suddilution progresses as Indthat the critical fsolvent temperature rises with dilution.

The most efficient methodtherefore, is to bring the hot size in contactwith a small quantity of hot water and subsequently dilute it with smalladditions of hot water of higher temperature, the temperature beingincreased with the dilution until is is discharged into cold Water forstabilization.

wWhat claim is: f

1. A method of diluting resin size containingl free rosin which consistsin mixing hot size With hot Water Within a conduit in various distinctstages of progressive'dilution -and then discharging (the l size intocooler partially diluting it in successive.' distinct 15` stages withhot rwater which flows continuf ously into Contact with the hot sizewith which it blends and increases the dilution.

3. A method of diluting hot resin size.

containing free resin, which consists in y20 bringing vthe size4 intoContact with hotl f 'Witten/Within a pipe inder steps of successivestages of inceasing and descreasing pressure, and thent 4discharging thesize into cooler Water.

In testimony w creo-f I aiix my signature.

Jenson A. DECEW.`

